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CD74HCT245 Datasheet(PDF) 2 Page - Texas Instruments

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No. de pieza CD74HCT245
Descripción Electrónicos  High Speed CMOS Logic Octal-Bus Transceiver, Three-State, Non-Inverting
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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CD74HCT245 Datasheet(HTML) 2 Page - Texas Instruments

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Description
The Harris CD54HC245, CD54HCT245, and CD74HC245,
CD74HCT245 are high-speed octal three-state bidirectional
transceivers
intended
for
two-way
asynchronous
communication between data buses. They have high drive
current outputs which enable high-speed operation while
driving large bus capacitances. They provide the low power
consumption of standard CMOS circuits with speeds and
drive capabilities comparable to that of LSTTL circuits.
The
CD54HC245,
CD54HCT245,
CD74HC245
and
CD74HCT245 allow data transmission of the B bus or from
the B bus to the A bus. The logic level at the direction input
(DIR) determines the direction. The output enable input
(OE), when high, puts the I/O ports in the high-impedance
state.
The HC/HCT245 is similar in operation to the HC/HCT640
and the HC/HCT643.
Functional Diagram
Ordering Information
PART NUMBER
TEMP.
RANGE (oC)
PACKAGE
PKG.
NO.
CD54HC245F
-55 to 125
20 Ld CERDIP
F20.3
CD54HCT245F
-55 to 125
20 Ld CERDIP
F20.3
CD74HC245E
-55 to 125
20 Ld PDIP
E20.3
CD74HCT245E
-55 to 125
20 Ld PDIP
E20.3
CD74HC245M
-55 to 125
20 Ld SOIC
M20.3
CD74HCT245M
-55 to 125
20 Ld SOIC
M20.3
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer or die for this part number is available which meets all elec-
trical specifications. Please contact your local sales office or
Harris customer service for ordering information.
18
17
16
15
13
11
12
14
2
B0
B1
B2
B3
B4
B5
B6
B7
OE
DIR
1
19
4
9
3
5
6
7
8
A0
A1
A2
A3
A4
A5
A6
A7
TRUTH TABLE
CONTROL INPUTS
OPERATION
OE
DIR
L
L
B Data to A Bus
L
H
A Data to B Bus
H
X
Isolation
H = High Level, L = Low Level, X = Irrelevant
To prevent excess currents in the High-Z (Isolation) modes all I/O
terminals should be terminated with 10k
Ω to 1MΩ resistors.
CD54HC245, CD54HCT245, CD74HC245, CD74HCT245
CD54HC245, CD54HCT245, CD74HC245, CD74HCT245


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